? 發問於 教育及參考書標準及測試 · 1 十年前

pollen grain=male gamete?

pollen grain 係唔係等如 male gamete

我係咁諗

但做past paper 果時 見到solution 寫 pollen grain 只係 male gamete的 carrier .......

想知清楚 !!

thx

2 個解答

評分
  • 1 十年前
    最愛解答

    pollen grain is not male gamete

    after pollination,the pollen grain is transferred on the stigma

    then,the sugary solution of stigma stimulate the pollen grain to produce enzyme

    the cells of stigma is digested.

    A pollen tube is developed from the pollen grain to the micropyle.

    Only the male gamete will be transferred through the pollen tube,

    and fertilize with the ovum in the ovary

    the pollen grain remains on the stigma.

    Therefore,maie gamete is only a part of pollen grain which is used to carry the male gamete.

  • 1 十年前

    pollen grain 唔等於 male gamete

    你係會考只可以答

    pollen grain contain/carry male gamete for pollnation

    資料來源: 08會考生
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